nlcst-pattern-match

nlcst-pattern-match

Pattern match for NLCST.

Install

Install with npm:

npm install nlcst-pattern-match

Usage

patternMatcher.tag : TagPattern

patternMatcher.tag is a tagged function. It is used with template literal.

patternMatcher.match(text:string, pattern: TagPattern)

match text with pattern that is result of tag function.

patternMatcher.matchCST(cst: Root, pattern: TagPattern)

match cst with pattern that is result of tag function.

Example

You write Pattern of NLCST object in patternMatcher.tag`${object}`.

import { PatternMatcher } from "nlcst-pattern-match";
import { EnglishParser } from "nlcst-parse-english";
const englishParser = new EnglishParser();
const patternMatcher = new PatternMatcher({
    parser: englishParser
});
const pattern = patternMatcher.tag`Bob ${{
    type: "*",
    data: {
        pos: /^VB/ // verb
    }
}} it.`;
const text = "Bob does it.";
const results = patternMatcher.match(text, pattern);
assert.equal(results.length, 1, "results should have 1");
const [result] = results;
assert.deepEqual(result.position, {
    index: 0,
    end: {
        column: 13,
        line: 1,
        offset: 12
    },
    start: {
        column: 1,
        line: 1,
        offset: 0
    }
});
// https://github.com/syntax-tree/nlcst NodeList
assert.deepEqual(
    result.nodeList,
    [
        {
            type: "WordNode",
            children: [
                {
                    type: "TextNode",
                    value: "Bob",
                    position: {
                        start: { line: 1, column: 1, offset: 0 },
                        end: { line: 1, column: 4, offset: 3 }
                    }
                }
            ],
            position: {
                start: { line: 1, column: 1, offset: 0 },
                end: { line: 1, column: 4, offset: 3 }
            },
            data: { pos: "NNP" }
        },
        {
            type: "WhiteSpaceNode",
            value: " ",
            position: {
                start: { line: 1, column: 4, offset: 3 },
                end: { line: 1, column: 5, offset: 4 }
            }
        },
        {
            type: "WordNode",
            children: [
                {
                    type: "TextNode",
                    value: "does",
                    position: {
                        start: { line: 1, column: 5, offset: 4 },
                        end: { line: 1, column: 9, offset: 8 }
                    }
                }
            ],
            position: {
                start: { line: 1, column: 5, offset: 4 },
                end: { line: 1, column: 9, offset: 8 }
            },
            data: { pos: "VBZ" }
        },
        {
            type: "WhiteSpaceNode",
            value: " ",
            position: {
                start: { line: 1, column: 9, offset: 8 },
                end: { line: 1, column: 10, offset: 9 }
            }
        },
        {
            type: "WordNode",
            children: [
                {
                    type: "TextNode",
                    value: "it",
                    position: {
                        start: { line: 1, column: 10, offset: 9 },
                        end: { line: 1, column: 12, offset: 11 }
                    }
                }
            ],
            position: {
                start: { line: 1, column: 10, offset: 9 },
                end: { line: 1, column: 12, offset: 11 }
            },
            data: { pos: "PRP" }
        },
        {
            type: "PunctuationNode",
            value: ".",
            position: {
                start: { line: 1, column: 12, offset: 11 },
                end: { line: 1, column: 13, offset: 12 }
            },
            data: { pos: "." }
        }
    ],
    `\n${JSON.stringify(result.nodeList)}\n`
);
assert.strictEqual(result.text, "Bob does it.");

Wildcard(*)

* value is match all value.

const englishParser = new EnglishParser();
const patternMatcher = new PatternMatcher({
    parser: englishParser
});
const pattern = patternMatcher.tag`These are ${{
    type: "*", // <= any type is ok
    data: {
        pos: /^NN/
    }
}}.`;
const text = "These are cars. Cool!";
const results = patternMatcher.match(text, pattern);
assert.ok(results.length === 1, "should have 1 result");

Addition Nodes

You can use NLCST for matching pattern. Additionally, you can use following special Nodes.

PatternNode

PatternNode represent RegExp pattern.

const englishParser = new EnglishParser();
const patternMatcher = new PatternMatcher({
    parser: englishParser
});
const pattern = patternMatcher.tag`if you want to ${{
    type: "PatternNode",
    pattern: /[\w\s]+/
}}.`;
const text = "Click Delete if you want to delete the entire document.";
const results = patternMatcher.match(text, pattern);

Changelog

See Releases page.

Running tests

Install devDependencies and Run npm test:

npm i -d && npm test

Contributing

Pull requests and stars are always welcome.

For bugs and feature requests, please create an issue.

• Fork it!
• Create your feature branch: git checkout -b my-new-feature
• Commit your changes: git commit -am 'Add some feature'
• Push to the branch: git push origin my-new-feature
• Submit a pull request :D

Author

• github/azu
• twitter/azu_re

License

MIT © azu